差动液压缸,若使其往返速度相等,则活塞面积活塞杆面积的( )。 A 、l倍 B、2倍 C、 3倍 ,,
A.
1倍
B.
2倍
C.
3倍
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参考答案:
举一反三
【简答题】A publisher faces the following demand schedule for the next novel by one of its popular authors: The author is paid $2 million to write the book, and the marginal cost of publishing the book is a con...